RomRaider

Good info , pazi .

Here is a pic from log with m54 manifold .
Just a line , but stable 520mg/str from 2.5k to 6k.

That's really good!

This is how mine looks with m50 intake and s52 cams. As I said there is that spike at 6000 RPM, but then it falls on it's face. I would like much better if it had flat torque curve, even if it costs that small hp peak.


This is after I got the mechanical problem in my engine, so there is those dips before 2500 and 5500 which weren't there before, so ignore those.

Can't find any performance cams there. What I have find, the enem z2 cams have 280 degrees on both cams which work with stock lifters and price is bit over 1000€ delivered to me: http://www.vpmotorsport.fi/product/222/ ... z2-bmw-m50

VAC motorsport has similar ones available, but those would be 1800€ before I could get my hands on those. So no thanks!

Yes, only 257 with vanos though, 282/257 without vanos .
Unbelievable high price for those vac cams !

What is your max load with s52? Over 600?

Edit : vac dominator cams on ebay , check it out .

I think it's hair over 600. I get very good max torque because 310Nm is good number for 2.8 litre engine. It just comes quite high rpm.

Well buy it now price in ebay is 1999 usd, when vac motorsport sells new ones for 1450 usd. Good deal but yeah after shipping, tax and import charges, those vac xams would be really expensive.

Hi,

the difference in measured drag power between MAHA and Bosch dynos is normal. I totally don't get, how MAHA comes up with these high numbers, but in the end, the calculated power at crank is almost the same.

I have measured 237hp and 297Nm@crank on my b28 with M50 intake and Schmiedmann headers on 98 octane fuel (around 200hp@ the wheels on a Bosch dyno). It flowed max. around 550mg/str.@5500rpm. Most b28 should make easily 225-230hp with stock cams, some more, some less.


Maybe you should have a look at Dbilas cams, regrinded original cams are less than 500Euros a pair.

Just going to post a little update regarding controlling the disa valve.

Using "muffler flap" output is going to restrict the functionality of how ecu is controlling the valve due to the code .

anything below the set Tps is going to let the ecu Ground the output on Pin 52.
anything above the set Tps is "Off" on the output pin52.

To make this output opposite , i have used an 87a relay . that is normaly closed on pin 87a

On relay :
Terminal 30 -- Ground
87- nothing (when relay is active)
86- Ground Output from Pin 52 Ecu
85- ignition switched 12v
87a- To Disa valve Grey/purpule wire

Mufflerflap map is now set to Tps 30% from idle to 4000rpm
and 112,8% from 4000rpm to infinity
The 30% value is calculated from the M54 Ms43 Disa map

The reasond i did this is because leaving the disa closed (active) on idle and 1200-2500 the car gets wery jumpy on light throttle . MAF value spikes abnormal due to heavy vacum in the manifold.

thanks for all this work. I just have some questions, since in the e46 forum they recommend to put the m50 manifold on m54 an claim
to gain power and do not loose any torque down low...

quite confusing.
if someone could give a comment, here is my source
https://forum.e46fanatics.com/showthrea ... 015&page=8

yes, sure, at 6k rpm as pazi wrote. the peak hp is going to be higher , but you loose så mutch below 4krpm, where you are most of youre driving time . I`ve gained a lot of tourqe after I installed m54 intake. And to loose 10-15 hp at top (never checked, but lower load mg/str) is not what you feel while driving

cool! thanks for this quick answer.


if anyone needs some more reading stuff. I have attached the BMW DISA explication

Quick question, should I use the M52 MAF or the M54 MAF. M54 has a bigger diameter, so the M52 is too small to fit the M54 intake hose and the M54 has wrong connector.
I can copy the M54 MAF map if needed but the
connector has only 3 wires...
thanks for a quick answer

use search function.
for myself I use m52b28tu, but also can be maden by m54b30 ... specially if you already need to retune dme.

I have a M52 Head. Not the TU one. I cannot find the answer to this approach via the search function. I guess i would need the M52 because of wiring.

okay here it is

https://www.romraider.com/forum/viewtop ... 2&start=15

M52 MAF is not the restriction so no use in swapping it for n/a.
but since i tune my engine anyway can use M54B30 intake. need to short the grounds to make from 4 connectors to 3. And copy maps from
ms43.

Have any of guys have some experience of running that "turbo" aluminium manifold N/a?

like this:
https://www.aliexpress.com/item/3290965 ... web201603_

OR:

https://www.ksr.as/en/products/bmw-race ... ifold-80mm